CN116145486A - Airflow enhanced roadbed ventilation structure, composite roadbed structure and construction method thereof - Google Patents
Airflow enhanced roadbed ventilation structure, composite roadbed structure and construction method thereof Download PDFInfo
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- 238000009423 ventilation Methods 0.000 title claims abstract description 192
- 239000002131 composite material Substances 0.000 title claims abstract description 36
- 238000010276 construction Methods 0.000 title abstract description 16
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C1/00—Design or layout of roads, e.g. for noise abatement, for gas absorption
- E01C1/005—Means permanently installed along the road for removing or neutralising exhaust gases
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C3/00—Foundations for pavings
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C3/00—Foundations for pavings
- E01C3/06—Methods or arrangements for protecting foundations from destructive influences of moisture, frost or vibration
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C7/00—Coherent pavings made in situ
- E01C7/08—Coherent pavings made in situ made of road-metal and binders
- E01C7/10—Coherent pavings made in situ made of road-metal and binders of road-metal and cement or like binders
- E01C7/14—Concrete paving
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/60—Planning or developing urban green infrastructure
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Abstract
The invention discloses an airflow enhanced roadbed ventilation structure, a composite roadbed structure and a construction method thereof. The composite roadbed structure comprises a roadbed, an airflow enhanced roadbed ventilation structure and a heat pipe system; the roadbed comprises a roadbed filler layer, a ventilation board lower leveling layer, a ventilation board upper cushion layer and a pavement structure layer which are sequentially arranged from bottom to top; the ventilation board in the airflow enhanced roadbed ventilation structure is arranged between the lower leveling layer of the ventilation board and the upper cushion layer of the ventilation board; the heat pipe system comprises more than one heat pipe, and one end of the heat pipe is inserted into the roadbed from the roadbed slope and is positioned below the ventilation plate. According to the composite roadbed structure provided by the invention, the advantages of resisting differential deformation of roadbed and improving the rigidity of roadbed are improved through the ventilation plate, and meanwhile, the deep thawing deformation of frozen soil roadbed is reduced through controlling the thawing of the middle part of a wide roadbed through the heat pipe system.
Description
Technical Field
The invention belongs to the technical field of road construction, and particularly relates to an airflow-enhanced roadbed ventilation structure, a composite roadbed structure and a construction method of the airflow-enhanced roadbed ventilation structure.
Background
China is the third most frozen soil country in the world, the permafrost area accounts for about 21.5% of the territorial area, and the physical and mechanical properties of the permafrost are very sensitive to temperature changes. In recent years, global climate is warmed, regional permafrost degradation is remarkable, and diseases of road workers Cheng Dongrong in permafrost areas frequently occur. For a road with a high grade in a permafrost region, the road is subjected to strong heat effect of large road surface width, strong heat absorption of a black asphalt road surface and high heat storage of a thick-layer road surface structure, has larger thermal disturbance to the underlying permafrost, and has extremely high control difficulty on the road freeze-thawing deformation. However, the existing heat pipes and the composite roadbeds thereof are limited by the cooling range and the energy in the ventilation board of the ventilation board road is obviously attenuated along the journey, so that the different deformation problems of various roads are still obvious, and the requirements of high standards of high-grade roads are difficult to meet.
Disclosure of Invention
The invention mainly aims to provide an airflow enhanced roadbed ventilation structure, a composite roadbed structure and a construction method thereof, so as to overcome the defects in the prior art.
In order to achieve the above purpose, the technical scheme adopted by the invention comprises the following steps:
the invention provides an airflow-enhanced roadbed ventilation structure, which comprises:
the ventilation board is arranged in the roadbed and comprises more than one airflow enhanced ventilation hole, the airflow enhanced ventilation hole comprises a ventilation hole body which is arranged along a first direction, the diameter of the ventilation hole body is reduced along a specified direction, the ventilation hole body comprises a horn end, a first accelerating section and a first smoothing section which are sequentially arranged along the specified direction, and the specified direction is a direction from the main wind direction side of the roadbed to the weak wind side;
and the negative pressure air suction device is arranged on the weak wind side of the roadbed and is communicated with the vent hole body.
Further, the vent body specifically comprises a horn end, a first accelerating section, a first smoothing section and a second accelerating section which are sequentially arranged along a specified direction;
preferably, the vent body specifically includes a horn end, a first accelerating section, a first smoothing section, a second accelerating section, and a second smoothing section that are sequentially disposed along a specified direction.
Further, the specified direction is perpendicular to the road driving direction.
Further, the first accelerating section and the second accelerating section are of unequal wall thickness, but the first accelerating section and the first smoothing section are of equal wall thickness.
Further, the horn end of the vent hole body and the negative pressure air suction device are exposed from the main wind direction side and the weak wind side of the roadbed respectively.
Further, the ventilation board is arranged in the roadbed along the horizontal direction and is distributed at a position below the cement stabilizing layer below the pavement.
Further, the negative pressure air suction device comprises a wind driven hood and a ventilation pipe, one end of the ventilation pipe is communicated with the ventilation hole body, the other end of the ventilation pipe is provided with the wind driven hood, and the wind driven hood is higher than a road surface.
The invention also provides a composite roadbed structure, which comprises a roadbed, the airflow enhanced roadbed ventilation structure and a heat pipe system;
the roadbed comprises a roadbed filler layer, a ventilation board lower leveling layer, a ventilation board upper cushion layer and a pavement structure layer which are sequentially arranged from bottom to top;
the ventilation board in the airflow enhanced roadbed ventilation structure is arranged between the lower leveling layer of the ventilation board and the upper cushion layer of the ventilation board;
the heat pipe system comprises more than one heat pipe, and one end of the heat pipe is inserted into the roadbed from the roadbed slope and is positioned below the ventilation plate.
Further, the heat pipe comprises an evaporation section and a condensation section which are connected in sequence, wherein the evaporation section is coated inside the roadbed, and the condensation section is exposed outside the roadbed.
Further, the condensation section of the heat pipe extends from the side slope of the roadbed on the main wind direction side or the weak wind side.
The invention also provides a construction method of the composite roadbed structure, which comprises the following steps:
filling a roadbed filling layer;
paving a ventilation board lower leveling layer on the roadbed filling layer;
assembling a prefabricated ventilation board on a leveling layer below the ventilation board;
paving an upper cushion layer and a pavement structure layer of the ventilation board on the ventilation board in sequence;
and arranging a negative pressure air suction device matched with the ventilating plate, thereby forming the airflow enhanced roadbed ventilating structure.
Further, the construction method of the composite roadbed structure further comprises the following steps:
one end of more than one heat pipe is inserted into the roadbed from the roadbed slope and is positioned below the ventilation plate.
Further, the method further comprises:
a step of prefabricating a maintenance ventilation board, comprising: firstly, building a ventilation board pouring template, then installing a forming pipeline of an airflow enhanced vent hole in the ventilation board pouring template, and then pouring a ventilation board unit body on the template and maintaining.
Compared with the prior art, the invention has the following beneficial effects:
(1) The airflow enhanced roadbed ventilation structure provided by the invention consists of a ventilation plate provided with variable-section ventilation holes and a negative pressure air suction device, and is used for enhancing airflow velocity in a ventilation pipeline, reducing along-path energy attenuation in the ventilation pipeline, eliminating uneven cooling of the ventilation pipeline along the path and reducing transverse uneven deformation of a road.
(2) The airflow enhancement vent hole in the airflow enhancement type roadbed ventilation structure is used for improving the overall cooling strength and cooling effect of the roadbed, when in a main wind direction season, cold energy enters from the horn end of the airflow enhancement vent hole and reaches the first acceleration section, the diameter of the airflow enhancement vent hole is gradually reduced, the energy dissipation of the ambient low-temperature airflow entering the airflow enhancement vent hole along the rear path is reduced, the airflow velocity is gradually increased, so that the forced convection heat exchange capacity is improved, and the uneven cooling caused by the dissipation of the along-path energy is reduced; meanwhile, the negative pressure air suction device is connected with the air flow enhancement vent hole, and consists of a wind driven hood and a ventilation pipe, and generally, the hood is arranged on a road surface, so that the forced convection cooling effect of air flow in the vent hole of the ventilation board is enhanced.
(3) The smooth section in the airflow enhanced roadbed ventilation structure can increase the internal and external heat exchange area of the ventilation plate and strengthen the working efficiency of the ventilation plate; in addition, a plurality of smooth sections are arranged at intervals along the ventilation board, so that the heat exchange area inside and outside the ventilation board can be further increased, and the working efficiency of the ventilation board is enhanced; meanwhile, the length of the airflow-enhanced vent hole is increased due to the arrangement of the smooth section, and the composite roadbed with larger width distance can be adapted, so that the application range of the vent plate is wider.
(4) According to the composite roadbed structure provided by the invention, the advantages of resisting differential deformation of roadbed and improving the rigidity of roadbed are improved through the ventilation plate, and meanwhile, the deep thawing deformation of frozen soil roadbed is reduced through controlling the thawing of the middle part of a wide roadbed through the heat pipe system; the problem that the position of the ventilating board cannot be accurately arranged by the existing ventilating board arrangement method is solved, the close contact between the roadbed and the ventilating board is realized, and the problem that the roadbed is unevenly deformed due to the existing ventilating board installation technology is solved.
(5) When the heat pipe in the composite roadbed structure works, the condensing medium of the evaporation section absorbs heat and evaporates, the condensing medium after absorbing heat and evaporating becomes gas, and flows to the condensation section, and heat exchange is carried out between the condensation section and the outside, so that the roadbed is cooled; the straight pipe is obliquely inserted or the L-shaped heat pipe is adopted, so that the refrigeration on the middle part of the roadbed can be enhanced, the roadbed is melted and sunk from the middle part of the roadbed, and the creep deformation of deep frozen soil is inhibited.
(6) The arrangement of the heat pipes in the composite roadbed structure can increase the strength of the female roadbed regulated by the heat pipes, improve the regulating efficiency and is more beneficial to uniform temperature distribution in the roadbed.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments described in the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic view of an airflow enhancing ventilation board according to an embodiment of the present application.
Fig. 2 is a cross-sectional view of an airflow-enhancing ventilation board provided in an embodiment of the present application.
Fig. 3 is a schematic view of a roadbed according to an embodiment of the present application.
Fig. 4 is a schematic view of a composite roadbed structure according to an embodiment of the present application.
Fig. 5 is a schematic view of the construction of a composite roadbed structure of a roadbed.
Reference numerals illustrate: 100-airflow enhanced vents; 10-vent body; 11-a first acceleration section; 12-a second acceleration section; 13-smoothing the segment; 14-horn end; 200-negative pressure air suction device; 21-a ventilation pipe; 22-wind driven hood; 200-heat pipes; 300-roadbed; 310—main wind direction side; 320-weak wind side; 330-a first layer of roadbed filler; 340-a leveling layer under the ventilation board; 350-a ventilation board upper cushion layer; 360-pavement structural layer; 1000-ventilation board; 2000-ground surface.
Detailed Description
In view of the defects of the prior art, the inventor of the scheme through long-term research and a large number of practices, develops a composite roadbed structure, and has the core that a transverse ventilation board is arranged at the lower part of a pavement subbase layer, so that the vertical strong heat flow disturbance of the pavement structure layer can be blocked in warm seasons, the roadbed can be cooled through forced convection in cold seasons, the rigidity of the pavement structure layer can be enhanced, and the differential deformation of the pavement structure layer can be effectively resisted; meanwhile, in order to reduce the large thawing deformation caused by deep permafrost degradation, an L-shaped heat pipe or an inclined buried heat pipe is arranged at the middle lower part of the roadbed slope. The technical scheme, the implementation process and the principle thereof are further explained as follows.
One aspect of the present invention provides an air flow enhanced subgrade ventilation structure comprising:
the ventilation board is arranged in the roadbed and comprises more than one airflow enhanced ventilation hole, the airflow enhanced ventilation hole comprises a ventilation hole body which is arranged along a first direction, the diameter of the ventilation hole body is reduced along a specified direction, the ventilation hole body comprises a horn end, a first accelerating section and a first smoothing section which are sequentially arranged along the specified direction, and the specified direction is a direction from the main wind direction side of the roadbed to the weak wind side;
and the negative pressure air suction device is arranged on the weak wind side of the roadbed and is communicated with the vent hole body.
In some preferred embodiments, the vent body specifically includes a horn end, a first accelerating section, a first smoothing section, and a second accelerating section disposed in sequence along a specified direction.
In some more preferred embodiments, the vent body specifically includes a horn end, a first accelerating section, a first smoothing section, a second accelerating section, and a second smoothing section sequentially disposed along a specified direction, where the caliber of the horn end is denoted as d0, the smallest caliber of the first accelerating section is denoted as d1, the caliber of the first smoothing section is denoted as d1, the smallest caliber of the second accelerating section is denoted as d2, the caliber of the second smoothing section is denoted as d2, the length of the first accelerating section is denoted as l1, the length of the first smoothing section is denoted as l2, the length of the second accelerating section is denoted as l3, the length of the second smoothing section is denoted as l4, the length of any position of the vent body is denoted as l, the calibers are denoted as d, and d and l satisfy the following relationship:
in some preferred embodiments, the specified direction is perpendicular to the road driving direction.
In some preferred embodiments, the first accelerating section and the second accelerating section are of unequal wall thickness, but the first accelerating section and the first smoothing section are of equal wall thickness; the hole wall is determined according to the thickness and the aperture of the ventilation board, the thickness of the ventilation board is unchanged, the aperture is changed, so that the wall thickness is changed, the wind speed along-path loss can be reduced by changing the aperture, and the airflow velocity is enhanced; by arranging the smooth section, the aperture and the wall thickness are unchanged, and the construction is convenient.
In some preferred embodiments, the horn end of the vent body and the negative pressure air suction device are exposed from the main wind direction side and the weak wind side of the roadbed respectively.
In some preferred embodiments, the ventilation board is disposed in the roadbed in a horizontal direction and is distributed below a stabilization layer in the roadbed.
In some preferred embodiments, the ventilation board includes a plurality of air flow-enhancing ventilation holes spaced apart in a direction perpendicular to the designated direction, wherein the pitch of adjacent air flow-enhancing ventilation holes is 0.25 to 0.5m.
In some preferred embodiments, the negative pressure air suction device comprises a wind driven hood and a ventilation pipe, one end of the ventilation pipe is communicated with the ventilation hole body, the other end of the ventilation pipe is provided with the wind driven hood, and the wind driven hood is higher than the road surface.
Another aspect of the embodiments of the present invention provides a composite roadbed structure, including a roadbed, the aforementioned airflow-enhanced roadbed ventilation structure, and a heat pipe system;
the roadbed comprises a roadbed filler layer, a ventilation board lower leveling layer, a ventilation board upper cushion layer and a pavement structure layer which are sequentially arranged from bottom to top;
the ventilation board in the airflow enhanced roadbed ventilation structure is arranged between the lower leveling layer of the ventilation board and the upper cushion layer of the ventilation board;
the heat pipe system comprises more than one heat pipe, and one end of the heat pipe is inserted into the roadbed from the roadbed slope and is positioned below the ventilation plate.
In some preferred embodiments, the heat pipe comprises an evaporation section and a condensation section which are connected in sequence, wherein the evaporation section is coated inside the roadbed, and the condensation section is exposed outside the roadbed;
in some preferred embodiments, the heat pipe system includes a plurality of heat pipes spaced apart in a direction perpendicular to the specified direction, wherein a pitch of adjacent heat pipes is 2.0m to 4.0m; wherein, the direction perpendicular to the specified direction refers to the extending direction of the road surface.
In some preferred embodiments, the heat pipe may include an oblique insertion type heat pipe or an L-type heat pipe, but is not limited thereto.
In some preferred embodiments, the condensing section of the heat pipe extends from a slope of the subgrade on the main wind side or the weak wind side.
The embodiment of the invention also provides a construction method of the composite roadbed structure, which comprises the following steps:
filling a roadbed filling layer;
paving a ventilation board lower leveling layer on the roadbed filling layer;
assembling a prefabricated ventilation board on a leveling layer below the ventilation board;
paving an upper cushion layer and a pavement structure layer of the ventilation board on the ventilation board in sequence;
and arranging a negative pressure air suction device matched with the ventilating plate, thereby forming the airflow enhanced roadbed ventilating structure.
In some preferred embodiments, the construction method of the composite roadbed structure further comprises:
one end of more than one heat pipe is inserted into the roadbed from the roadbed slope and is positioned below the ventilation plate.
In some preferred embodiments, the method further comprises:
a step of prefabricating a maintenance ventilation board, comprising: firstly, building a ventilation board pouring template, then installing a forming pipeline of an airflow enhanced vent hole in the ventilation board pouring template, and then pouring a ventilation board unit body on the template and maintaining.
The following detailed description of the technical solutions according to the embodiments of the present invention will be given with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Examples
Frozen soil is a special rock soil with a temperature of 0 ℃ or below 0 ℃ and containing ice. The physical and mechanical properties of the heat pipe are very sensitive to temperature change, the construction requirements of the high-grade road in the cold region are urgent, the existing heat pipe and the composite roadbed thereof are limited by the cooling range of the heat pipe and the influence of significant energy along the path in the ventilation board of the ventilation board road, various road difference deformation problems are still significant, and the requirements of the high-grade road on high standards are difficult to meet. Therefore, the composite roadbed structure provided by the application not only can provide the basic effect of cooling, but also can solve the composite problems of limit of the cooling range, obvious attenuation of energy in the ventilation board along the path and the like.
It should be noted that, the roadbed 300 is divided into a main wind direction side 310 and a weak wind direction side 320 according to the local wind direction, and the main wind direction side 310 and the weak wind direction side 320 are determined according to the wind directions of wind received by side slopes on both sides of the roadbed, and are related to the roadbed trend, the roadbed height and the local wind direction. The wind energy is greater on the main wind side 310 and on the opposite weak wind side 320.
As shown in fig. 1-2, the present example provides an airflow-enhanced roadbed ventilation structure, which includes a ventilation plate 1000 and a negative pressure suction device 200, which are disposed in a roadbed 300, and includes one or more airflow-enhanced ventilation holes 100, the airflow-enhanced ventilation holes 100 including a ventilation hole body 10 arranged in a first direction, the diameter of the ventilation hole body 10 being reduced in a specified direction, and the ventilation hole body 10 including a flare end 14, a first accelerating section 11, and a smoothing section 13, which are sequentially disposed in the specified direction, the specified direction being a direction from a roadbed main wind direction side 310 to a weak wind side 320; the negative pressure suction device 200 is disposed at the weak wind side 320 of the roadbed 300 and communicates with the vent body 10.
The vent body 10 is used for reducing energy dissipation along the way of ambient low-temperature air flow, and the vent body 10 comprises a first accelerating section 11, a second accelerating section 12, a smoothing section 13 and a horn end 14 which are axially arranged; the horn end 14 is arranged on the vent hole body 10 and positioned on the main wind direction side 310, and is used for ensuring that ambient low-temperature airflow can enter the vent hole 10; the first accelerating section 11 is arranged at the other side of the horn end 14 and connected with the horn end for improving the cooling function of the vent hole 100; the second accelerating section 12 is arranged at one side far away from the first accelerating section 11 and is used for ensuring that the cooling energy can continuously exert efficacy in the airflow enhanced ventilation hole 100; the smooth section 13 is located between the first accelerating section 11 and the second accelerating section 12, ensuring the flow of the cooling air in the ventilation hole 10. The first accelerating section 11 and the second accelerating section 12 are respectively arranged at two axial ends of the vent hole 10, so that the cooling function of the vent hole 100 can be improved, and the lengths of the first accelerating section 11 and the second accelerating section 12 can be equal or different according to the wind speed difference degree at two ends of an actual roadbed.
The negative pressure air suction device 200 is disposed at the end with small aperture of the vent hole, and the negative pressure air suction device 200 is used for enhancing forced convection cooling effect of the air flow in the air flow enhanced vent hole 100 of the ventilation board 1000.
The negative pressure suction device 200 further includes a wind driven hood 22 and a ventilation pipe 21.
The ventilation pipe 21 is connected with the airflow-enhancing vent hole 100 on the weak wind side slope 320 so as to better drive the flow of wind energy inside the airflow-enhancing vent hole 100; the wind driven hood 22 is connected to the other end of the ventilation pipe 21 and is higher than the road surface 370, so that the forced convection cooling effect of the air flow in the air flow enhanced ventilation hole 100 of the ventilation board 1000 is enhanced.
In this embodiment, referring to fig. 2, the first accelerating section 11 and the second accelerating section 12 have unequal wall thicknesses, but the smooth sections 13 connected with the first accelerating section and the second accelerating section have equal wall thicknesses, so that the same wall thickness ensures that the cooling effect on the road surface is the same when the low-temperature air flows in the smooth sections.
In some embodiments, the vent body 10 may also include only the first accelerating section 11, the smoothing section 13 and the horn end 14, where the first accelerating section 11 is connected to the horn end 14, and the smoothing section 13 enables the first accelerating section 11 to communicate with the negative pressure suction device 200.
Further, referring to fig. 2, a plurality of smooth sections 13 may be disposed, so as to further increase the heat exchange area inside and outside the ventilation board 1000, and enhance the working efficiency of the ventilation board 1000; in specific implementation, the vent body 10 specifically includes a horn end 14, a first accelerating section 11, a first smoothing section 13, a second accelerating section 12 and a second smoothing section 13' sequentially disposed along a specified direction, wherein the caliber of the horn end 14 is denoted as d0, the smallest caliber of the first accelerating section 11 is denoted as d1, the caliber of the first smoothing section 13 is denoted as d1, the smallest caliber of the second accelerating section 12 is denoted as d2, the caliber of the second smoothing section 13' is denoted as d2, the length of the first accelerating section 11 is denoted as l1, the length of the first smoothing section 13 is denoted as l2, the length of the second accelerating section 12 is denoted as l3, the length of the second smoothing section 13' is denoted as l4, the length of any position of the vent body is denoted as d, and d and l satisfy the following relation:
meanwhile, the smooth section 13 increases the length of the airflow-enhanced ventilation hole 100, and can adapt to the roadbed 300 with larger width distance between the main wind side 310 and the weak wind side 320, so that the application range of the ventilation board 1000 is wider. In some embodiments, the airflow-enhancing vent 100 may also include only a smooth section 13.
In this embodiment, the ventilation board 1000 includes a plurality of airflow-enhancing vents 100 and a negative pressure suction device 200 arranged at intervals; the respective air flow enhancing vent holes 100 are arranged at intervals in a direction perpendicular to the extending direction of the heat pipe 1000, and the interval between two adjacent vent holes 100 is 0.25 to 0.5m. Of course, the number of the air flow-enhancing vent holes 100 and the interval between the air flow-enhancing vent holes 100 may be appropriately adjusted according to the actual needs and the size of the roadbed 300. The ventilation board 1000 shown in this embodiment includes two airflow-enhancing vents 100, and in other embodiments, the ventilation board 1000 may include one, three, and more other numbers of airflow-enhancing vents 100.
In actual engineering, the vent body 10 of the airflow-enhanced vent 100 is arranged in a direction perpendicular to the road driving direction with respect to the roadbed 300, the first accelerating section 11 and the second accelerating section 12 are located in the roadbed 300, and the horn end 14 and the negative pressure device end 20 protrude from the main wind direction side 310 and the weak wind side 320 of the roadbed, respectively, and are exposed to the environment.
The present application example also provides a composite subgrade structure comprising subgrade 300, the aforementioned airflow enhanced subgrade ventilation structure, and a heat pipe system; as shown in fig. 5, the roadbed 300 includes a roadbed filler layer 330, a ventilation board lower leveling layer 340, a ventilation board upper bedding layer 350 and a pavement structure layer 360 which are sequentially disposed from bottom to top; ventilation board 1000 in the airflow enhanced subgrade ventilation structure is disposed between ventilation board lower screed layer 340 and ventilation board upper shim layer 350; the heat pipe system comprises more than one heat pipe 200, one end of the heat pipe 200 is inserted into the roadbed from the roadbed slope and is positioned below the ventilation plate 1000; the heat pipe 200 includes an evaporation section and a condensation section connected in sequence, the evaporation section is covered inside the roadbed, the condensation section is exposed outside the roadbed, and the condensation section of the heat pipe 200 extends from the side slope of the roadbed 300 at the main wind direction side 310 or the weak wind side 320, wherein the heat pipe 200 is an oblique insertion type heat pipe or an L-shaped heat pipe.
The arrangement of the heat pipe 200 can strengthen the middle part of the roadbed 300 for refrigerating, and the cooling of deep frozen soil can be effectively realized by inserting the heat pipe from the side slope position of the roadbed 300, so that the middle part of a road is reduced to be thawed down, and creep deformation of the deep frozen soil is inhibited.
In actual engineering, the roadbed 300 includes a plurality of heat pipes 200 arranged at intervals, each heat pipe 200 is arranged at intervals in the direction of the extending direction of the road surface, and the interval between two adjacent heat pipes 200 is 2.0 m-4.0 m, however, the number of the heat pipes 200 and the interval between the heat pipes 200 can be properly adjusted according to actual needs and the size of the roadbed 300. The composite subgrade structure shown in this embodiment includes two heat pipes 200, and in other embodiments, the composite subgrade structure may include one, three, and more other numbers of heat pipes 200.
As shown in fig. 3 and 4, the roadbed 300 is filled on the frozen ground surface 2000 which is compacted by treatment, the roadbed 300 comprises a main wind direction side 310 and a weak wind side 320, and the wind direction side 310 and the weak wind side 320 bear different environmental cold wind energy. The ventilation board 1000 is horizontally arranged along the arrangement direction of the wind direction side 310 and the weak wind side 320, and the first acceleration section 11, the second acceleration section 12, and the smoothing section 13 are buried in the yin-yang slope subgrade 300, and the horn end 14, the ventilation pipe 21, and the hood 22 are exposed to the environment. When the main wind direction is in season, after the cold energy enters from the horn end 14, the cold energy reaches the first acceleration section 11, and at the moment, the diameter of the vent hole 100 is gradually reduced, so that the energy dissipation of the ambient low-temperature airflow entering the vent hole 100 is reduced, the airflow velocity is gradually increased, the forced convection heat exchange capacity is improved, and the uneven cooling caused by the dissipation of the airflow along the path is weakened. Meanwhile, the ventilation hole 100 is connected with the negative pressure suction device 20 through the ventilation pipe 21, and generally, the wind driven hood 22 is disposed above the road surface, so that the forced convection cooling effect of the air flow in the ventilation hole 100 of the ventilation board 1000 is enhanced.
The embodiment of the application also provides a prefabricated maintenance process of the ventilation board 1000, and the prefabricated maintenance process of the ventilation board 1000 comprises the following steps:
building a ventilation board 1000 pouring template; installing a variable-section airflow enhanced vent 100 molding pipeline in a pouring template of the ventilating board 1000; and pouring the unit body of the ventilation board 1000 on the template and curing.
The embodiment of the application provides a construction method of a composite roadbed structure, which comprises the following steps of;
as shown in fig. 5, the original ground surface 2000 is cleaned, the foundation is compacted, a first layer of roadbed filling soil 330 is paved on the ground surface 2000, rolling is carried out until the compaction degree reaches the standard, a first layer of coarse sand cushion layer is paved on the first layer of roadbed filling soil 330 as a lower leveling layer 340 of the ventilating plate, the grain size of gravel is not more than 10mm, the mud content is not more than 5%, the thickness after compaction is 0.1m, ventilating plates 1000 are distributed on the lower leveling layer 340 of the ventilating plate at intervals, adjacent ventilating plates 1000 can be connected in a butt joint or embedded lap joint mode, after the paving is finished, the upper cushion layer 350 of the ventilating plate 1000 is paved and rolled on the ventilating plate 1000, and finally, the pavement structure layer 360 is constructed. The construction method of the composite roadbed structure solves the problem that the position of the ventilating board cannot be accurately arranged by the existing ventilating board arrangement method, achieves close contact between the roadbed and the ventilating board, and solves the problem that the roadbed is unevenly deformed due to the existing ventilating board installation technology. Wherein, the first layer of roadbed filling 330, the ventilation board lower leveling layer 340, the ventilation board upper cushion layer 350 and the pavement structure layer 360 together form the yin-yang slope roadbed 300.
The ventilation board 1000, the heat pipe 200, the composite roadbed structure and the construction process thereof provided by the embodiment of the application, the ventilation board 1000 structure can flexibly control the effective working length of the ventilation board 1000 according to actual needs. The roadbed system provided with the ventilating plate 1000 is used for a permafrost region, and under the combined action of the ventilating holes 100 and the negative pressure air suction device 20, the cooling efficiency of the ventilating plate 1000 is enhanced, the problems that the existing heat pipes and the composite roadbed are limited by the cooling range of the heat pipes and the influence of energy along the path in the ventilating plate road ventilating plate is obviously attenuated are solved, various road difference deformation problems are solved, and the long-term stability of the roadbed is improved.
In addition, the inventors have conducted experiments with other materials, process operations, and process conditions as described in this specification with reference to the foregoing examples, and have all obtained desirable results.
While the invention has been described with reference to an illustrative embodiment, it will be understood by those skilled in the art that various other changes, omissions and/or additions may be made and substantial equivalents may be substituted for elements thereof without departing from the spirit and scope of the invention. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the invention without departing from the scope thereof. Therefore, it is intended that the invention not be limited to the particular embodiment disclosed for carrying out this invention, but that the invention will include all embodiments falling within the scope of the appended claims. Moreover, unless specifically stated any use of the terms first, second, etc. do not denote any order or importance, but rather the terms first, second, etc. are used to distinguish one element from another.
Claims (10)
1. An airflow-enhanced subgrade ventilation structure, comprising:
a ventilation board (1000) which is provided in a roadbed (300) and includes one or more airflow-enhanced ventilation holes (100), the airflow-enhanced ventilation holes (100) including a ventilation hole body (10) arranged in a first direction, the diameter of the ventilation hole body (10) decreasing in a prescribed direction, and the ventilation hole body (10) including a horn end (14), a first acceleration section (11), and a first smoothing section (13) which are provided in this order in the prescribed direction, the prescribed direction being a direction directed from a roadbed main wind direction side (310) to a weak wind side (320);
and a negative pressure suction device (200) which is provided on the weak wind side of the roadbed (300) and communicates with the vent hole body (10).
2. The airflow enhanced subgrade ventilation structure according to claim 1, wherein: the vent body (10) specifically comprises a horn end (14), a first accelerating section (11), a first smoothing section (13) and a second accelerating section (12) which are sequentially arranged along a designated direction;
preferably, the vent body (10) specifically includes a horn end (14), a first accelerating section (11), a first smoothing section (13), a second accelerating section (12) and a second smoothing section (13') sequentially arranged along a designated direction, wherein the caliber of the horn end is denoted as d0, the minimum caliber of the first accelerating section is denoted as d1, the caliber of the first smoothing section is denoted as d1, the minimum caliber of the second accelerating section is denoted as d2, the caliber of the second smoothing section is denoted as d2, the length of the first accelerating section is denoted as l1, the length of the first smoothing section is denoted as l2, the length of the second accelerating section is denoted as l3, the length of the second smoothing section is denoted as l4, the length of any position of the vent body is denoted as l, the calibers are denoted as d, and d and l satisfy the following relation:
3. the airflow enhanced subgrade ventilation structure according to claim 2, wherein: the appointed direction is perpendicular to the road driving direction;
and/or the first accelerating section (11) and the second accelerating section (12) are of unequal wall thickness, but the first accelerating section (11) and the first smoothing section (13) are of equal wall thickness;
and/or the horn end (14) of the vent hole body (10) and the negative pressure air suction device (200) are exposed from the main wind direction side and the weak wind side of the roadbed respectively.
4. The airflow enhanced subgrade ventilation structure according to claim 1, wherein: the ventilation plate (1000) is arranged in the roadbed along the horizontal direction and is distributed below the cement stabilizing layer of the pavement structure;
and/or the ventilation board (1000) comprises a plurality of airflow-enhancing ventilation holes (100) arranged at intervals along a direction perpendicular to the specified direction, wherein the distance between adjacent airflow-enhancing ventilation holes (100) is 0.25-0.5 m.
5. A gas flow enhanced subgrade ventilation structure according to claim 1 or 3, characterized in that: the negative pressure induced draft device (200) comprises a wind driven hood (22) and a ventilation pipe (21), one end of the ventilation pipe (21) is communicated with the ventilation hole body (10), the other end of the ventilation pipe is provided with the wind driven hood (22), and the wind driven hood (22) is higher than the road surface (370).
6. A composite subgrade structure characterized by comprising a subgrade (300), an airflow enhanced subgrade ventilation structure of any of claims 1-5, and a heat pipe system;
the roadbed (300) comprises a roadbed filler layer (330), a ventilation board lower leveling layer (340), a ventilation board upper cushion layer (350) and a pavement structure layer (360) which are sequentially arranged from bottom to top;
the ventilation board (1000) in the airflow enhanced roadbed ventilation structure is arranged between the lower leveling layer (340) of the ventilation board and the upper cushion layer (350) of the ventilation board;
the heat pipe system comprises more than one heat pipe (200), and one end of the heat pipe (200) is inserted into the roadbed from the roadbed slope and is positioned below the ventilation plate (1000).
7. The composite subgrade structure according to claim 6, wherein: the heat pipe (200) comprises an evaporation section and a condensation section which are sequentially connected, wherein the evaporation section is coated inside the roadbed, and the condensation section is exposed outside the roadbed;
and/or the heat pipe system comprises a plurality of heat pipes (200) arranged at intervals along the path, wherein the distance between adjacent heat pipes (200) is 2.0 m-4.0 m;
and/or, the heat pipe (200) comprises an oblique insertion type heat pipe or an L-shaped heat pipe.
8. The composite subgrade structure according to claim 6, wherein: the condensing section of the heat pipe (200) extends from the side slope of the roadbed (300) on the main wind direction side (310) or the weak wind side (320).
9. A method of constructing a composite subgrade structure as set forth in any one of claims 6-8, including:
filling a roadbed filler layer (330);
paving a ventilation board lower leveling layer (340) on the roadbed filling layer (330);
assembling a prefabricated ventilation board (1000) on a leveling layer (340) below the ventilation board;
sequentially paving an upper cushion layer (350) and a pavement structure layer (360) of the ventilation board on the ventilation board (1000);
and providing a negative pressure suction device (200) cooperating with the ventilation board (1000) to form the airflow enhanced subgrade ventilation structure of any of claims 1-5.
10. The method of constructing a composite subgrade structure according to claim 9, further comprising:
inserting one end of more than one heat pipe (200) from the roadbed slope into the roadbed and below the ventilation plate (1000);
and/or, the method further comprises:
a step of prefabricating a curing ventilation board (1000), comprising: firstly, building a ventilation board pouring template, then installing a forming pipeline of an airflow enhanced vent hole (100) in the ventilation board pouring template, and then pouring a ventilation board unit body on the template and maintaining.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310063829.5A CN116145486B (en) | 2023-01-17 | 2023-01-17 | Airflow enhanced roadbed ventilation structure, composite roadbed structure and construction method thereof |
| US18/384,388 US11987937B1 (en) | 2023-01-17 | 2023-10-27 | Airflow-enhanced embankment ventilation structure, composite embankment structure, and construction method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310063829.5A CN116145486B (en) | 2023-01-17 | 2023-01-17 | Airflow enhanced roadbed ventilation structure, composite roadbed structure and construction method thereof |
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| CN116145486A true CN116145486A (en) | 2023-05-23 |
| CN116145486B CN116145486B (en) | 2023-07-14 |
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- 2023-01-17 CN CN202310063829.5A patent/CN116145486B/en active Active
- 2023-10-27 US US18/384,388 patent/US11987937B1/en active Active
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| CN116145486B (en) | 2023-07-14 |
| US11987937B1 (en) | 2024-05-21 |
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